Comment 6 for bug 1893624

It worked: via grub booted 5.8 and no more errors at boot. However, brightness setting is not persistent after a reboot anymore, screen is at max brightness after each reboot. If I modify it using the keyboard, it immediately starts at the lowest brightness.

It's a minor issue. Not a big deal.

I will stay away from 5.8.5 for now. Thanks for your help!